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Agents2026-08-30 · source-backed
v4.0.0b5, released August 28, introduces ClientGroup: one managed client per server, each negotiating independently, with collision-checked tool namespacing and call routing. That replaces fronting several servers with a proxy that forces one negotiated version across all of them. (GitHub) If you've been stuck on the oldest server's protocol era, this is the fix.
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LangChain supports MCP / Shared entities / Same source domain / Shared topic / Earlier coverage
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FastMCP supports MCP / Shared entities / Same source domain / Shared topic / Earlier coverage
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OpenAI supports MCP / Shared entities / Same source domain / Shared topic / Earlier coverage
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Anthropic released MCP / Shared entities / Same source domain / Shared topic / Earlier coverage
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Cloudflare supports MCP / Shared entities / Same source domain / Shared topic
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Mastra supports MCP / Shared entities / Same source domain / Earlier coverage / Tension
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FastMCP supports MCP / Shared entities / Same source domain / Shared topic / Earlier coverage
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Anthropic released MCP / Shared entities / Same source domain / Earlier coverage / Tension
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